I always wanted to start a lottery that would pay off your house if you won.
Over a short amount of time, more and more people's houses would be paid for. It would help out the local people so fast, that it would make heads spin.

It would probably also destroy all the banks.

But honestly, borrowing $100 from a bunch of people and paying cash for a house would be so much better economically. There was one lady who did this. She borrowed $5 from everyone in town and bought a house. Then she turned around and started giving things to everyone. Which got her even more things given to her.